The day I received the Clippers I shaved 6 cats, one after another. Through the first few cats the clippers stayed cool enough. With the last three cats I had to stop a couple of times during each cat to cool the blade. I didn't purchase any cooling spray, so I used an ice pack covered with a thin cloth to cool it down and it worked great. The Clippers cut through the hair quickly and easily with only two nicks out of 6 cats. It was the first time I'd ever shaved any animal and the Clippers were very easy to use. I also used pheromone spray to calm the cats first. It won't put them to sleep but I believe it helped. I decided to shave my indoor cats because somehow we ended up with fleas in the house. It worked and the flea problem is contained. Since I shaved them I have been spraying them once a day with a 50/50 solution of apple cider vinegar and water. It works better than advantage and is natural. I will be continuing to shave them on a regular basis every few months because the reduction of hair in the house has been awesome. I would definitely recommend these slippers. Great product for the price.